| http://www.w3.org/ns/prov#value | - The aqueous solution comprising:(a) about 0.1 wt. % to about 2 wt. % of a surface active agent of the formula: ##STR10## wherein R is an alkyl or dialkyl containing from 4 to 25 carbon atoms; n is an integer of from 2 to 4; m is an integer of from 1 to 50; and M is a cation; and (b) about 0.1 wt. % to about 4 wt. % of a petroleum sulfonate. 9.
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